Sewing machine



Jul 6, 1926; 1 1,591,319

F. JOHNSON SEWING MACHINE Filed May 5. 1923 2 Shoots-Shoot i 35 B 7 1 IZ 1,4

42 INVENTOIj.

ATTORNEYS;

July 6,1926. 1,591,319

F. JOHNSON SEWING MACHINE Filed May 5. 1923 2 mints-sh: 2

L l L n INVENTOR: M; y

A TTORNEYS.

' 7 quality of the'work. f

Patented luly 6,1926 i 7 2 9 9 1 91 TE STATES FRITZ JOHNSON, or RACINE, Wisconsin, AssiGNoRTomtrE ones. treatments? 00., or RAQINE, Wisconsin, "A CORPORATION or Wisconsinv snwmo MAcHINn. i

I Application; filed May-5, 1923. Serial mates, v

This invention relates morejpartioularly on the upper ends [of verticalshafts 17, to duplex or two-needle lock-stitch sewing which are provided with spiral gears 18, machines having rotary hooks'for carrying meshing with the; gears 9. IRelatively1sta the (needle threads around the bobbin -tionary bobbin cases. 19, loosely mounted, l5 threa s.' 1 J A. I Its mainobjects'are to facilitateturning therewith, are provided with lugs 20 for corners and to improve the appearance and holding them f against; rotation. with the f i Y hooks Within; the bobbin cases 19 are-re It consist in the construction, arrangement movably fittedbobbins 21, which areheld in.

' 10 and combination of parts as hereina'fter parplace-therein by latches 22. The hooks 16165 V ticularly described and pointed out. in the arerotated by the gears 9 and 18 at theme claims. I of two revolutionsi to each reciprocation off In the accompanying drawing like charthe needles 2, and. are adapted to take the f iaicters designate the same parts in the several thread from the needles and loop it around 1 'ures. A s

Figure 1 is a side elevation of a portion therewitlL' d ,7 p of a two-needle lockastitch sewing machine The mechanism thus far describedlislike embodying the-invention, ,ajpo'rtiOnIof the or similar in'construction and operation to bed plate being-broken away to disclose that of well knownduplex lock stitehsew, r 20 mechanism below it Fig. 2 is anfenlarged ing machines and need not-be more specifi- 75 ypla'n View of: the mechanism below the bed cally described;

' plate, the.supporting-bearings and connec The rotary h oks I ,7 p bobbin cases tionsofflthe mechanism beingfshown in hori l9 and bobbins 21, are carried bysaddlesior izo'ntal' section; Fig. 3 isan. enlarged end brackets 24 and. 25,'i injwhich-. the shafts 17 0f View as seen from the left relative to Figs 1 the hooks are; journaled At one end the 80 and 2, the bed plate being shown in sectiong saddlesa-re formed'with collars 26L and 27, Fig. 4 isa detail front view on-a still larger which are mounted on sleeves or bushings 28 scale, ofthe rotary. hooks, bobbin cases, and 29, through which the shaft passes;

' bobbins, needles, -and parts associated there; and which-are fastenedbyset screwsiin the 0f with, the feed bar or dog, throat plate and adjacent bearings 7, as shown in:Fig.-2. 5;.

bed or work plate beingshown insection; I g The collar 26 is split,an dkclamped by a and Figs. 5, 6 and 7 are diagrams'illustratscrew 30. on the'sleeve 28, andthecollar2T; ingthe'operationofthemachine-in turning pivots onthesleeve 29 and isheld in place;

'a corner. I -V thereon by'collars or flanges l ancl32, the T The machine comprises'ia verticallyrecip;collar 32 being, removably anjclf adjustably. .1 0

rocatingneedle bar.1, provided withneedles fastened on the sleeveby a setf-screw.

2 and connectedwith a'horizontal actuating; Attheend opposite the -collar 201m sad --shaft (not i shown) having 'bearingsin. Tali} dle24 is adjustably' fastened tothe bedplate l overhangingarm. 8 of the machine frame-8 by ascrew 35L passing through atransverse j wand provided with a belt-pulley 4. A shaft vslot in the ;saddle and threaded in'the bed '95;; l 6,,supp'orted by bearings 7,1011 and 'belowa; plate, as shown in Figs. 1 and 2. 7 i

) horizontalbed or work plate 8 parallel-with? At the end opposite thecollar27, the sadthe needle actuatingshaft', is rotated 'syn-, dle 25 is'forked'and engages an eccentric 36 l' chrono'usly with said shaftiby aiconnectiom on a horizontalishaft37, provided with an 1 gears 9 and with a' feed eccentric 10. of the saddle in a forked bracket 89 adjusta reciprocating feed bar 12, connected at blyfastened to the under ,side 'ofthe v bedl oneend with the eccentric 1-0, is provided plate 8 by screws passing transverse slots with toothed dogs 113, which work in an inthe bracket andth'readed thebedplate. 7' e 9 opening in a throat plate 14 removablyifitted A' spring 41, connecting'thearm ,38 with fiw in an opening in thebed plate 8, as shown. the bedplate 8,:tends to turn the arm up in Fig. 4. The dogs l3 are formed with} wardlyand the'eccentric 36'intopositi0n to holes for the passage of the needles 2 in hold the saddle25 with its rotary hook 1 6 sewing. in position to co-operate with the adjacent- I Rotary hooks or shuttles: arefmounted needle 2; The arm 38 is connected by aired within the hooks or shuttles l6,coaxially 00' I the bobbin. threads, to form look. s titchesio, I

" (r a -i P d with, Sp ral, Operating arm-38 andjournaled ateach side 42 with a lever or; other device :(not shown) within convenient reach of the hand, foot or knee of the operator, for turning the arinandthe saddle v25 down and lowering the associated hook 16 with-its bobbin case 19 and bobbin 21 into inoperative position, as

shown in Fig. 1.

drawal ofthen e edle' thread after it has been The lugs 20 on the right hand bobbin case 19, loosely engages a notch in or'lu'gs' 44 on the... h i t Plate 14, and the lug 20 on the left; hand vertically .mova ble bobbin case 19,

looselyqeii'ga'ges with a notch in or "s aced" lugs on the 1 under side' of an arm orstop,

4.5; s eered r cited m v le with the saddle ersas sh fwn ini s' To provide a free assage between" the. ladingside "of" the lug-' and the lug with whichit normally engages; its the with looped around the b obbin and bobbinthread,

ai or drag arm 17" is adj ustably fast ened to a rocker arm 48, which is pivotally means-a as each saddleand is connected' ;,bya link or strap arm? 4-9fwith1 an eccentric 50"611" the heck Shari iv; The eccentric: 50 is set on the shaft 17 in position toturn j the iiivvardly intd engagement with a projection 51'oii the rim of the associated isfed in ther sam'e direction till-"the needles reach the points (Z and 'e, the left hand bobbin ease 19 and to. turn" the bobbin case slightly backward at the proper time to release theneedle thread as it is withdrawn aftei being looped arouricl the bobbin and loiflfibifl th'fead.

adjustabletowards and from each other for varying the distance between the parallel seams as usual, and the bracket 39 which carries the ecc'eniri ss is adjustable on the bed plate8 to allow for the adjustment of the saddle'2'5;

In thebperation of the machine, to turn a corner, as illustrated in Figs. 5, 6 andi', two parallel seams a b and 0d, are sewed along one side of the work, which is fed in' the direction indicated by an arrow on Fig. 5. [When the inside or left hand needle 2 reaches the point b, the. left hand hook 1'6 with its bobbin case and bobbin are dropped by the operator into inoperative positioh,ais shown in Fig. 4, anchthe work needle. idly without forming stitches to -e, while the right hand needle continues the. outside seam from the poi-n tfto the "poiiit'cZ. The machine is then stopped "an'd the work is turned around the righthand needle "or the point d, to the left, as indicated by an arrow, into the po sition shown in Figfhjin which the point is broughttopposite the inside or left hand needle, whereuponflth'e operation of the machine 'i s resumed, tl1e "saddle 25 "with the left hand hook'being held queeroperative position till the insideor l'eft'hand needle The "eare 9',;asa aia 1es 24 and 25 are needle, bobbin cases centrally andloosely Two continuous 1 parallel seams, a 19: g and c d h, are thus simultaneously made, turning corresponding corners at b d 'without'stitching or" carrying the thread across the space between them, the, same as'wouid be ,pro-. duced 1 by se 'aarateoperations with: an ordinary one needle machine. 7

Various modifications in the 1 construction and arrangement of parts of the mechanism may be made without departing from the principle and scope of the invention" as defined in the following claims.

I claim':- g

1. In a sewing machine, stitch-- forming mechanism comprising two needles and rotary' hooks one-of which is movable out of and into operative relation to; the associated needle, ;mea'ns operatively connected to the movable hook for yielding-1y holding the;

same in operative position, and 'a'manuall-y" operable member supported for movement in a givendirection and operatively associated with saidrmovable hook and said means for causing simultaneous yielding of the latter and movement of said hook to inoperative position upon movement in said direction, said yieldable means acting to return said hook to operative position upon release of said member.

2. In a sewing'machine the combination 1 with a reciprocating needle bar provided with two needles, of two rotary hooks adapted 'to cooperate. with the needles to form stitches, hook supporting saddles one of which is-movable with its hook out of op er'ative position relative to the associated carried by the hooks, means holding the bobbin cases against-rotation withthe hooks, spring means acting on the movable saddle for yieldingly holding the same inoperative position, and manually operable 'meanseir gaging said saddle'and arranged upon movement ina given direction to simultaneously 'effect yielding of said spring means and movement 'of sa d saddle to inoperative position.

' 3. In "a sewing machine theicombination with a vertically reciprocating needle bar' provided'wit'h twjo needles, two'horizontally rotatablelhooks adapted to cooperate iwith P the needles to form stitches and 1 adjustable horizontal shaft, and relatively stationary with abed plate, a vertically reciprocating needle bar located above thebed plate, and provided with two needles, a horizontal shaft below the bed plate, and means for rotating said shaft, ofsa'ddles, one of which ,is movable vertically,located below thebed late hooks rotatabl mounted on vertical axes in the "saddles and. geared with" the bobbins carried by the hooks coaXia-lly therewith, one ofthe hooks and bobbins being shiftablezat will with the vertically movable saddle into and out of operative relative to the associated needle.

5. In a sewing machine the combination with stitch forminggmechanis'in comprising reciprocating needles, rotary hooks,bobbin cases and bobbins for forming parallel position seams with two threads, of a supporting member carry ng one of the hooks with a .bobbin case andbobbin into and out of operative position relative to the associated needle, a spring tending to retain said meme ber withits hook, bobbin case and bobbin in operative position, and means for slmultaneouslyfovercoming the action'of said spring and effecting movement of said member with its hook, bobbin case and bobbin out of operative position. 1

6. In a. sewing machine the combination with a bed plate and stitch forming mechanism comprising a vertically reciprocating needle bar located above'the bedplate and provided with needles and afrotary horizontal shaft located below the bed plate, of hook and bobbin supporting saddles supported at one end on said shaft, rotary hooks having vertical shafts journaledin the saddles andgearediwith said shaft, relatively stationary bobbin cases loosely and coaxially mounted within the hooks, an eccentric supported from the bed plate in engagement with one of the saddles,"and-means forturning the eccentric" at will to" shift the saddle with which it is connected and its hook out of operative relation to the i p come the action of said'spring and to isiinulcombination with a bed plateand stitch forming inechaassociated needle.

7.-In a sewing machine the nism' comprising a vertically reciprocating it needle bar located above the'bed plate and a horizontal shaft located below 'the bed nature.

plate, of saddles onevof which is pivotally mounted to swing vertically on said shaf rotary hooks having vertical shafts journaled in the saddles and geared;with.said

shaft, bobbin cases loosely and-,coaxially mounted within] the hooks and provided with lugs to hold them again'stfrotation therewith, means for swinging the pivotally mounted saddle at will to shift its hook into-and out of operative relation to'the associated needle, anda stop on the vpivotally mounted saddle engaging the lugfo n its, bobbin case and holding it against rotation with the associatedhook,

8. In a sewing machine the combination wit-ha bed plate and stitch forming mecha-' nism comprising a reciprocating needle bar located above the bed plate and providedwith needles and a horizontal rotary shaft located below the bed 'plate, of-saddles one of'which is pivotally mounted to swing v er' tically onsaid shaft, rotary hooks" having vertical shafts journaled'in the saddles and geared with said shaft,bobbi11 cases loosely and coaxially mounted within the hooks,

means for holding the bobbin cases against rotation with the hooks, 1a rocker shaft car ried by the bed plate and provided with an V operating arm and with an eccentric inf "engagement with the verticallymovable sadg; dle, and a-spring'connectedwith said arm and normally holding the movable saddle with its hook in operative relation to the associated needle.

i 9.. Ina sewing machine, the'combination with a plurality of needles, and hooks sup.

ported and arranged for cooperation with said needles, one of said'ho oks being movable fromv operative to inoperative positions and vice'ver'sa, of yieldable means for holding saidchook one-of said ositions, and actuating means adapted and other of said positions; Q 1

10. Int-a sewing machina'ithe operative to inoperative positions andvice verse, of a spring for holding said f' ho'ok in operative position, and manually operable. means adapted; and. arranged to overtaneously move said hook toinoperative'po s1tion.-

10o v 7 arranged to over f con 1e the action'of said yie'ldable means and to simultaneously move said hook to the V r 1 15 In witness whereof hereto afiix mysig- V FRITZ JOHNSON} V 

